Diffusion is when molecules move into available space. It’s the spread of something more widely. Substances diffuse in high concentrated area to a low concentrated area. Water is one molecule that can diffuse freely in a cell. Other molecules need assistance through the cell membrane through a process called facilitated diffusion. Osmosis moves from an area of low concentration to high concentration. In osmosis water moves in the opposite way. Water flow is determined by the concentration‚ not
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Pg. 25 Once drug goes into mucosal cells‚ the concentration gradient will decrease. Blood supply to mucosal cell keeps removing drug continuously so the drug conc is smaller & this (heavy vascularisation) maintains constant gradient so that the drugs are constantly removed into the blood stream pH in stomach about 2 Implication: weak acids absorbed readily‚ weak bases not absorbed as readily Implication: some of the drugs may not be able to suvive that acidic environment. & they may disintegrate
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Student Name: I. Diffusion Define the following terms. Solvent Solute Solution. Diffusion Concentration gradient Dynamic equilibrium EXERCISE 1 – Factors influencing rate of diffusion Predict how molecule size and temperature will affect the outcome of this experiment. Record the data from the information in the lab. Potassium Permanganate R.T. Methylene Blue R.T. Time (min) Total Diameter (mm) Distance of Diffusion * (mm) Rate (mm/min)
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pores of the bag. Sucrose was not able to pass through as the molecules were too big to enter. This is similar to a cell because the size of a molecule can determine whether or not the substance can enter the cell through diffusion. Larger molecules will require facilitated diffusion‚ using a transport protein‚ or active transport‚ using a transport protein and also ATP (HyperPhysics.edu). Since water can pass through the dialysis
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Osmosis and Diffusion During the past few weeks in my Ag Biology class we have been learning about and reviewing both osmosis and diffusion. We did two different labs‚ one on osmosis; the other on diffusion. The first lab we did was our diffusion lab. We learned that diffusion is moving something from an area of high concentration to a low concentration. We were showed that Mio and other flavor drops perform diffusion when put in water as an example. For the lab part we put a mixture of starch
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it takes way of water trying to enter the seed‚ therefore creating a blockage and will become inactive or germinate slowly (cocoponics‚ 2011). Unlike diffusion‚ the mixing of solute particles with water‚ Osmosis is water mixing with solute particles to pass through the cell wall and provide nutrients to the cell. Since osmosis is a type of diffusion that only involves water moving through the permeable membrane‚ salinity affects seed germination through osmotic effects (Bliss et al.‚ 1986). When
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AP BIOLOGY CELL UNIT ACTIVITY #5 NAME_____________________ DATE___________HOUR_____ CELL TRANSPORT MEMBRANE PROPERTIES PASSIVE TRANSPORT CHARACTERISTICS: DIFFUSION: Cell Unit Activity #5 page 1 OSMOSIS : ISOTONIC ANIMAL CELLS Cell Unit Activity #5 page 2 HYPOTONIC HYPERTONIC PLANT CELLS OSMOREGULATION – ADAPTATIONS Paramecium Fresh Water Bony Fish FACILITATED D IFFUSION: Cell Unit Activity #5 page 3 Marine Bony Fish ACTIVE TRANSPORT CHARACTERISTICS:
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Introduction: The reasons for doing this lab are so that we can learn about osmosis with a model similar to a cell and so that we can have a better understanding of the process and nature of osmosis. Osmosis is diffusion but with water molecules. A concentration gradient exists and because of this‚ diffusion of solutes can’t happen. Very select things can pass in and out‚ such as water‚ oxygen‚ and carbon dioxide. In this situation‚ a large molecule of starch would be dissolved in water because the molecule
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A potato battery is a type of electrochemical cell. An electrochemical cell converts chemical energy into electrical energy. In the potato battery‚ there is a transfer of electrons between the zinc coating the galvanized nail that will be inserted into the potato and the copper wire that will be inserted another part of the potato. The potato conducts electricity‚ yet keeps the zinc ions and copper ions separate‚ so that the electrons in the copper wire are forced to move (generate current). It’s
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active transport? What is passive transport? How is osmosis related to diffusion? How can we demonstrate active transport? How can we demonstrate Brownian movement? How can we demonstrate diffusion (2 ways)? How can we demonstrate osmosis (3 ways)? In terms of relationships between substances‚ how can we define “hypertonic”‚ “isotonic”‚ and “hypotonic”? What is the relationship between the size of a molecule and its rate of diffusion? ____________________________________________________________________________
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